Connected: An Internet Encyclopedia
RFC 822 - B.2. SEMANTICS

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### B.2. SEMANTICS

Headers occur before the message body and are terminated by a null line (i.e., two contiguous CRLFs).

A line which continues a header field begins with a SPACE or HTAB character, while a line beginning a field starts with a printable character which is not a colon.

A field-name consists of one or more printable characters (excluding colon, space, and control-characters). A field-name MUST be contained on one line. Upper and lower case are not distinguished when comparing field-names.

Next: APPENDIX C. DIFFERENCES FROM RFC #733

Connected: An Internet Encyclopedia
RFC 822 - B.2. SEMANTICS